首页|Diversification of ammonia-oxidizing microorganisms in seven geographically different paddy soils in Sichuan

Diversification of ammonia-oxidizing microorganisms in seven geographically different paddy soils in Sichuan

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The diversification of ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) communities and their potential nitrification activity (PNA) on a large scale have not been well documented. In this work, seven paddy soils from different geographic regions in Sichuan, P. R. China were selected to determine the spatial distribution of the activities,abundances and community compositions of AOB and AOA. PNA varied greatly among paddy soils, and was positively correlated with soil pH (P< 0.05). The abundance of AOA was 81.1 to 1670.0 times more than that of AOB, which indicates paddy soil environments favor the growth of AOA. Denaturing gradient gel electrophoresis fingerprints of amoA genes exhibited distinct spatial differences in AOA compositions rather than in AOB compositions. Sequencing analysis revealed that acidic soils were dominated by AOA within marine group 1.1a-associated lineage, whereas the soil group 1.1b lineage AOA predominated in neutral and alkaline soils. Both nitrosopira cluster 3-like and Nitrosomonas cluster 7-like AOB dominated the AOB communities in the paddy soils. Redundancy analysis suggested that soil NH4+-N content was the most significant driver determining the AOB community structure, while no significant correlation between AOA community structure and soil properties was found. The findings highlight that the activity and composition of ammonia oxidizers exhibit spatial variations in complex paddy fields due to the joint influence of soil variables associated with pH and N availability.

paddy soilammonia oxidizerslarge geographical scalepotential nitrification activitydiversification

LU Lu、LI Hui-lin、HE Yan、YANG Hong、ZHANG Jing、PENG Chao

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College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, Sichuan Province, P. R. China

Key Laboratory of Southwest China Wildlife Resources Conservation, College of Life Sciences, China West Normal University, Nanchong 637002, Sichuan Province, P. R. China

Funded by the National Natural Science Foundation of ChinaFundamental Research Funds of China WestNormal UniversityFundamental Research Funds of China WestNormal University

41606142463140412554

2018

重庆大学学报(英文版)
重庆大学

重庆大学学报(英文版)

影响因子：0.02
ISSN：1671-8224
年,卷(期)：2018.17(4)
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